Why Is MARATHON PETE CORP (MPC) Stock Down Today?

Marathon Petroleum Corp (MPC) shares fell 7.36% to $435.98, marking a sharp decline for the refiner. The drop coincides with a broader sell-off in the sector, where refiner stocks suffered their worst day since the tariff shock, driven by concerns over debt refinancing costs rather than cheaper oil prices.

What Happened

The session began with a 0.7% gap down from the prior close of $470.64. Trading remained volatile throughout the day, with the stock hitting a session high of $470.64 at 9:15 AM ET before sliding to a session low of $430.00 at 5:55 PM ET. The final print was $433.99. Volume stood at 1.8 million shares, which is 0.7 times the three-month daily average.

External context highlights pressure on the company’s balance sheet. Bruce Richards, Chief Executive Officer of CVC Marathon, warned that beaten-down CCC debt has few options other than defaulting as refinancing becomes increasingly expensive. Additionally, Representative Jamie Raskin warned American oil companies against helping sell Russian diesel under a new deal, stating they should proceed at their own risk. TD Cowen maintained a Buy rating on the stock and raised its price target to $478 from $450.

What The Data Shows

Fundamentals indicate a market cap of $128.4 billion with a P/E ratio of 16.4. Revenue grew 15.2% over the trailing twelve months, while the net margin stands at 5.5%. The stock has a beta of 0.54 and a dividend yield of 0.87%. The 52-week range is $161.93 to $493.98. Notably, the stock printed 45 fresh 52-week lows on October 27, 2026.

Insider activity shows a trend of selling. In the last 90 days, there were zero buys and five sells totaling $9.8 million. Recent Form 4 filings include sales by Shawn M. Lyon, Erin M. Brzezinski, and Molly R. Benson. Congressional trading also reflects selling, with four disclosed sales and no buys in the last 90 days. David J. Taylor sold shares in the $1,001 to $15,000 range on September 22 and July 24. Social chatter remains quiet, with only one post in the last seven days.

What To Watch

Investors will monitor coverage breadth and potential further moves in the 52-week low territory. The stock’s recent deterioration in sentiment, with a 7-day average below the 30-day average, suggests continued volatility.